Sieve and conveyer



Feb. 4, 1941. J. wb z SIEVE AND CONVEYER 3 Sheets-Sheet 2 Filed Dec. 20,1937 welzibl;

T7568 WOUZZV Patented Feb. 4, 1941 UNITED STATES SIEVE AND CONVEYERJosef Wiilz, Bochum, Germany, assignor to the firm Westfalia DinnendahlGroppel A.-G.,

B c um, G m y Application December 20, 1937, Serial No. 180,876 InGermany February 10, 1936;

10 Claims.

The invention. relatesto sievesand conveyers of the kind in which twobodies are actuated by cranks set 180 apart,- and; move.v inv opposite,directions in, acircular; or, elliptical path. According totheinventionthetwQ-bodies are actuated, without elastic means serving; for thestorage of power; by a horizontal crank shaft at or near the horizontalaxis of gravity of the two bodies, with double armed, horizontallymounted rockers connecting the two bodies near their ends.

The principal advantage of the invention is that it enables a balance ofinertia to be obtained, without elastic means serving for the storage ofpower.

Preferably the shaft is supported only by the two bodies, without havingbearings in a fixed frame. This enables the throw of the bodies to bealtered by changing the relative lengths of the rocker arms, whichcannot be done if the shaft is mounted in fixed bearings. Such fixedbearings for the shaft also have the disadvantage that under heavy loadthe sieve tends to set up vertical vibrations.

A further advantage is obtained by the invention if the rockers, mountedelastically at their pivots in known manner, are elastically engagedwith the moving bodies. No lubrication is then required at the joints,and there is no knock. The rockers may be arranged so that they canperform a wobble movement to ensure the regular opposite movement of thebodies, but a simpler method is to arrange that the rockers can onlyrotate in vertical planes and are connected to the bodies by links whichcan also only rock in vertical planes.

Examples of apparatus according to the invention are showndiagrammatically in the accompanying drawings, in which:

Figure 1 is a side view of the apparatus,

Fig. 2 is a cross-sectional view of the apparatus taken on line 2-2 ofFig. 1,

Fig. 3 is a sectional view of one of the rockers on an enlarged scale,

Fig. 4 is a side View of a modified construction,

Fig. 5 is a plan view of the construction of Fig. 4,

Fig. 6 is a sectional view of one of the rockers of the construction ofFigs. 4 and 5 on an enlarged scale,

Fig. 7 is a side view of a further modified construction,

Fig. 8 is a cross-sectional view of the apparatus of Fig. 7 taken online 8--8 of Fig. '7,

(Cl. i l-26) Fig. 9 is a side view of a still further modifiedconstruction, and,

Fig. 10 is a cross-sectional view of the apparatus of Fig. 9 taken online l-Hiof Fig. 9.

Referring first to the construction shown in Figs. 1 to 3, there are twoinclined sieves or bodies I, 2,,engaged with cranks on a.- horizontalcrank shaft3 which isat; or near the horizontal axis through the centreof gravity, the cranks being at an angle of 180 to each other so thatthe sieves swing in circular paths, in opposite directions. The shafthas no bearings in the fixed frame of the apparatus, and is supportedonly by the sieves l and 2. Near their ends the sieves are supported bydouble armed horizontal or approximately horizontal rockers 4, the lowersieve 2 being carried by rigid tubes or bars having brackets 6 thereon,connected to the outer ends of the rockers. The rockers are mounted uponfixed beams I, in eyes 8 within which they are fitted with elasticsleeves 9, e. g. of rubber, and the ends of the rockers engage intosimilar sleeves 9 carried by the sieve I and brackets 6. The rockersperform a wobble movement, their ends travelling in cir-, cular paths ofthe radius r (Fig. 3).

With the arrangement shown in Fig. 1 the upward and downward movementsof inertia are balanced, but a torque component operates when the sievesare moving in the directions indicated by the arrows in Fig. 1. This isavoided with the arrangement shown in Figs. 4 to 6, where there is asingle sieve I, the element 2 of the system consisting of lateralbalance weights 2 carried by the rockers 4. The weights fully balancethe sieve, both at rest and when working. This can be done with weightswhich are heavier or lighter than the sieve, the arms of the rockersbeing so proportioned with respect to the eyes 8 as to establish thebalance.

Figs. 7 and 8 show a construction in which brackets 5 support doublearmed rockers 412 having links 4m suspended from their ends, the sievesbeing carried by the links. The brackets are fixed to the ceiling of thework-room, or to an elevated beam. The shaft is between the two sieves,near the horizontal axis through the centre of gravity.

Figs. 9 and show a modification in which weights 2 are substituted forthe lower sieve. The shaft passes through the horizontal axis of gravityof the moving bodies. The rockers 4b" in this example are pairs ofsingle armed levers fixed to short shafts I0.

Instead of suspending the sieves as shown in liners may be used therein,not to allow wobble but to enable lubrication to be dispensed with.

I claim as my invention:

1. A vibratory sieve or conveyer comprising a pair of bodies, aplurality of double armed rockers for supporting the pair of bodies inspaced relationship to each other, and a crank shaft mounted directly inone of the bodies for imparting a vibratory action to the bodies on therockers so that they will describe a curved path.

2. A vibratory sieve or conveyer comprising a body, a plurality ofdouble armed rockers for supporting the body at one end of each of therockers, a counterweight mounted on the other end of the rockers, and acrank shaft for imparting a vibratory action to the body on the rockersso that it will describe a curved path.

3. A vibratory sieve or conveyer according to claim 1, in which thebodies describe a circular path at an angle of 180 to each other.

4. A vibratory sieve or conveyer according to claim 1, in which thebodies describe an elliptical path at an angle of 180 to each other.

5. A vibratory sieve or conveyer according to claim 1, in which elasticmounting means are provided for each rocker at a pivot point for therocker and at the body.

6. A vibratory sieve or conveyer according to claim 1, in which eachrocker is in the form of a lever pivoted between the ends so that thelever will rock in a vertical plane.

7. A vibratory sieve or conveyer according to claim 1, in which eachrocker is in the form of a. lever pivoted between the ends so that thelever will rock in a vertical plane, and in which a pair of links areprovided for each lever, each link being connected to one end of thelever and. to one of the bodies.

8. A vibratory sieve or conveyer according to claim 1, in which thecrank shaft is horizontally mounted in its respective body.

9. A vibratory sieve or conveyer according to claim 1, in which thedouble armed rockers are each mounted on an approximately horizontalaxis at a point on each body and at a fixed point.

10. A vibratory sieve or conveyer according to claim 1, in which thevibratory action of one of the bodies by the double armed rockers isimparted to the other body.

JOSEF Min.

